121721209201 has 8 divisors (see below), whose sum is σ = 127066927104. Its totient is φ = 116379948960.

The previous prime is 121721209157. The next prime is 121721209223. The reversal of 121721209201 is 102902127121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121721209201 - 2²¹ = 121719112049 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121721209201.

It is not an unprimeable number, because it can be changed into a prime (121721209501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1058545 + ... + 1167886.

It is an arithmetic number, because the mean of its divisors is an integer number (15883365888).

Almost surely, 2^121721209201 is an apocalyptic number.

It is an amenable number.

121721209201 is a deficient number, since it is larger than the sum of its proper divisors (5345717903).

121721209201 is a wasteful number, since it uses less digits than its factorization.

121721209201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2228831.

The product of its (nonzero) digits is 1008, while the sum is 28.

The spelling of 121721209201 in words is "one hundred twenty-one billion, seven hundred twenty-one million, two hundred nine thousand, two hundred one".